Matching wheels and tyres

General information

When radial or lateral runout of the wheel and tyre coincide, the imbalance of the wheel is amplified by the tyre.

For technical reasons, 100% true running is not possible ⇒ 4.5.1 Checking radial and lateral runout of wheels and tyres, tolerances.

Before match mounting the used wheels which are fitted on the vehicle, run the tyres warm. This will eliminate any flat spots caused by storage or handling, ⇒ 4.8 Determining flat spots on tyres.

Procedure for match mounting

• Let air out of tyre.
• Press tyre beads off wheel rim flanges.
• Apply tyre assembly paste all around the tyre beads.
• Rotate tyre by 180° relative to wheel rim.
• Inflate tyre to approx. 4 bar.
• Attach the wheel (together with tyre) to the wheel balancing machine.
• Check wheel for true running and for radial and lateral runout.

• Let air out and press tyre beads off the wheel rim flanges.
• Rotate the tyre by 90° relative to the rim (a quarter turn).
• Inflate tyre again to 4 bar and check true running.

• Press tyre off wheel rim flange again as described above.
• Rotate tyre by 180° relative to wheel rim (half a rotation).

If the radial and/or lateral runout are still not within the specified values, check the wheel for radial and/or lateral runout ⇒ 4.6 Checking radial and lateral run-out on wheel rim.

If the measured values for radial and lateral runout of the wheel are within the specified values, the tyre has unacceptably high radial or lateral runout. In this case, the tyre must be renewed.